First time man saw me naked

Story about how I went to swim in lake after school and got a bit tipsy.

To begin with, I'm Ela, quite tall, slim, brunette, freshly baked 18 years old. I work out and run from time to time.

Not so long ago we decided with group of friends 3 girls and 2 boys, that we'll go to swim in lake after school and have some beers. It was warm, sunny, so pretty fast I felt tipsy after drinking beer. We planned it all during lessons so we ended up swimming in underwear, after it I went into bushes to take of my underwear and put on some dry clothes.

When I was already naked I noticed that I wasn't alone there... local homeless drunkard was looking at me merely few meters away and I didn't noticed him before it was too late. He had like massive bulge on his pants. To this day I haven't seen adult man cock in real life. I immediately froze and tried to maintain eye contact.
He said something like "no need to hurry sweet heart, I already saw everything". I asked him to stop looking at me I blushed so much and tried to cover myself but... to be honest seeing him looking at me made me wet a bit. And you have to know that so far I was only kissing with two boys, but I play with myself from time to time.

He was massaging his bulge, I tried to turn around to pull on my dress and then I felt his hand on my booty and second wrapping around my waist... he groped my ass and breasts and I shivered involuntarily. I didn't wanted to call for help cause my friends would made fun of me for ending up in such situation. I asked him to stop, but his dirty, thick fingers already felt that I got aroused... he said "I just want to make you feel good" while breathing heavily into my neck and rubbing his hips along my ass. He was so hard and smelly that it made me a bit dizzy, I guess alcohol didn't helped. I clench my teeth and bit my lip to muffle moan as he started rubbing his palm over my tiny clit... it was so wrong he was so much older and dirty, but I couldn't push him away, it felt too good...

I needed to lean against him to support myself, he was kissing, licking and biting my neck and made me squeeze his bulge and when he felt that my knees give up he pushed me to kneel...